diff --git a/pkgs/development/haskell-modules/configuration-common.nix b/pkgs/development/haskell-modules/configuration-common.nix
index c22f69885b0a..a1b44d57f5fd 100644
--- a/pkgs/development/haskell-modules/configuration-common.nix
+++ b/pkgs/development/haskell-modules/configuration-common.nix
@@ -339,6 +339,9 @@ self: super: {
   # https://github.com/matterhorn-chat/matterhorn/issues/679 they do not want to be on stackage
   matterhorn = doJailbreak (super.matterhorn.overrideScope (self: super: {
     brick = self.brick_0_64_2;
+    # Doesn't support aeson 2.0
+    # https://github.com/matterhorn-chat/matterhorn/issues/759
+    aeson = self.aeson_1_5_6_0;
   }));
   memcache = dontCheck super.memcache;
   metrics = dontCheck super.metrics;